JP2022106260A - Cleaning tool and cleaning device - Google Patents

Abstract

To provide a tool capable of cleaning a difficult-to-clean area in a mold used for injection molding, etc., and a cleaning device using the tool.SOLUTION: A mixing tool is attached to a tip of a nozzle 8a of an air gun 6 to mix compressed air sprayed from the air gun with a cleaning fluid sprayed from the nozzle of an aerosol sprayer to spray a mixed aerosol. The cleaning fluid in the form of an aerosol is transported to the mixing tool via a tube 3 attached to the nozzle of an aerosol spray can 5. This configuration of a cleaning tool enables more effective cleaning than simple spraying, because the cleaning fluid is injected by the compressed air at high pressure, allowing the cleaning fluid to penetrate deep into a gas vent of a mold and a narrow void between components.SELECTED DRAWING: Figure 1

Description

There is an application for exception of loss of novelty

The present invention relates to an instrument used for cleaning a mold for injection molding or transfer molding, particularly for cleaning a gas vent that discharges gas in the mold to the outside in a molding process, and a cleaning device using the same.

Injection molding and transfer molding are widely used as methods for mass production of plastic products. The process is to install a screw that has the function of kneading and injecting the material inside the cylinder equipped with a heating device, and from the nozzle at the tip of the cylinder, a flow path provided in the mold, a sprue, The molten material is press-fitted into the cavity via the runner and gate.

When the material is press-fitted into the cavity, various molding defects occur unless the air in the cavity and the gas generated by heating the material are promptly discharged to the outside. As a countermeasure for this, it is common to provide a gap called a gas vent of several μm on the contact surface between the movable mold and the fixed mold, which is called a parting surface.

However, as the molding is repeated, the molten material, the solidified gas caused by the molten material, and the dirt called "yani" are clogged in the gas vent, and its function cannot be fully exhibited, so it is washed appropriately. It may be necessary to do.

As a technique for dealing with such a situation, Patent Document 1 describes a molding die main body having a fixed side mold and a movable side mold that form an annular cavity at the time of molding, and a fixed side attached to the fixed side mold. It has a block and a movable side block attached to the movable side mold, and allows gas from the cavity to pass through the facing surface between the fixed side block and the movable side block and cools and solidifies the melt-molded material. A molding die including a gas passage path and a built-in chill vent in which a gas introduction path for introducing the gas and the melt-molded material from the cavity into the gas passage path is formed and is arranged at a position surrounded by the cavity. In the movable side mold and the movable side block, a gas discharge movable side mold through hole and a gas discharge movable side are provided at positions beyond the outlet of the gas passage path so as to be continuous with each other. Each block through hole is formed, and the molding die is a cleaning pin having a gas vent hole formed inside, and is the gas discharge movable side mold through hole and the gas discharge movable side block through hole. By reciprocating in the air, the gas is discharged to the outside from the gas passage through the gas vent hole during molding, and after molding, the pin tip portion of the movable side block through hole for gas discharge is used. A molding die is disclosed, further comprising a cleaning pin having a function of removing a molding material that may adhere to an inner peripheral surface.

However, the molding die disclosed here has a complicated structure, and there is room for improvement in terms of initial cost.

Further, as a preventive measure before the material is introduced into the mold, the reduction of the clogging of the gas vent provided in the mold is described in Patent Document 2 in which the injection molding screw is rotatably inserted and hollow. A vent port penetrating from the outer surface of a cylinder having a cylinder having a cylindrical inner peripheral surface to the inner peripheral surface of the cylinder, and an outer shape along the inner contour of the vent port, and said A vent member that is removable from the vent port and at least one exhaust passage component provided in the vent member are provided, and the exhaust passage component incorporates the vent member into the vent port. In the state, by penetrating from the outer surface of the barrel to the inner peripheral surface of the cylinder, it is configured as a hollow exhaust passage for exhausting the gas component generated in the cylinder, and the vent port is the cylinder. Disclosed is an injection molding vent mechanism that extends along a direction in contact with the inner peripheral surface of the cylinder from the inside and in a direction opposite to the rotation direction of the injection molding cylinder.

However, even if the injection molding vent mechanism disclosed here is used, there is a possibility that the gas generated in the sprue runner in the mold cannot be sufficiently removed.

On the other hand, a cleaning liquid containing components such as trichloroethane, which is a solvent that dissolves organic substances, is used for cleaning tar caused by gas generated from the molten material, even in the voids between the members constituting the mold. It is used in the form of an aerosol in a spray can to penetrate.

However, depending on the parts of the mold, it may be difficult for the cleaning liquid to penetrate into the inside only by spraying. For example, Patent Document 3 discloses a degassing pin having a gas vent function developed by the present inventors.

FIG. 2 shows an ejector pin as an example of the patent. 2 (a) is a perspective view, FIG. 2 (b) is a cross section of AA, 9 is an ejector pin, and 10 is a gas vent. Since the gas vent 9 shown here is designed to have an extremely narrow width, it is difficult for the cleaning liquid to permeate, and it becomes even more difficult if tar adheres to the gas vent 9.

Japanese Patent Application Laid-Open No. 2015-110250 Japanese Unexamined Patent Publication No. 2016-215470 Japanese Patent No. 4678616

Therefore, an object of the present invention is to provide an instrument capable of cleaning a portion of a mold used for injection molding or the like, which is difficult to clean, and a cleaning device using the instrument.

As a means for cleaning molds and devices, a method is performed in which compressed air pressurized by a compressor is sprayed onto a portion to which dirt has adhered by an instrument called an air gun. This is the result of diligent studies on the combined use of and cleaning liquid.

The cleaning device according to one aspect of the present invention is joined to a flexible tube for transporting a cleaning liquid ejected from an aerosol spray nozzle and a nozzle of an air gun, and is transported from the hose-shaped member. It is characterized by having a mixed aerosol injection member having a function of mixing and injecting a cleaning liquid and compressed air.

Further, the cleaning device according to one aspect of the present invention is characterized in that the cleaning device is attached to the nozzle of an air gun.

In the cleaning device according to the present invention, the cleaning liquid supplied in the form of an aerosol permeates the gaps between the mold members and the inner part of a narrow portion such as a gas vent provided on the ejector pin by compressed air. Because it can be done, the mold can be easily cleaned.

The figure which shows an example of the cleaning apparatus which concerns on this invention. A diagram showing an ejector pin, which is an example of the patent application of the present inventor, FIG. 2 (a) is a perspective view, and FIG. 2 (b) is an AA cross section.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of a cleaning device according to the present invention. In FIG. 1, 1 is a cleaning tool, 2 is a tap for joining an air gun, 3 is a tube for transporting a cleaning liquid, 4 is a spray can cap, 5 is a spray can containing a cleaning liquid, 6 is an air gun, and 7 is an air gun. A high-pressure hose connecting an air compressor, 8a is an air gun nozzle, and 8b is a cleaning tool nozzle.

As shown in FIG. 1, by pushing the cap 4, the cleaning liquid sprayed in the form of an aerosol is introduced into the cleaning device 1 via the tube 3 and together with the compressed air jetted from the nozzle 8a of the air gun. It merges and is ejected from the nozzle 8b of the cleaning device. The cavity formed inside the cleaning device 1, that is, the flow path between the cleaning liquid and the compressed air, becomes a negative pressure due to the injection of the compressed air, so even if the tube is bent, it is in phase with the pressure from the spray can. In addition, the cleaning liquid is smoothly transported to the inside of the cleaning device 1 and sprayed from the nozzle 8b.

The material of the tube 3 is not particularly limited, but it is necessary that the tube 3 is insoluble in the cleaning liquid. For example, polyethylene, which is insoluble in most organic solvents at a temperature of 60 ° C. or lower, is suitable. Similarly, the cleaning tool 1 needs to be made of a material that does not dissolve in the cleaning liquid, and is preferably made of metal in consideration of durability.

As described above, according to the present invention, it is possible to provide an apparatus capable of efficiently cleaning gas vents and voids between members of a mold used for injection molding or the like. The present invention is not limited to the above-described embodiment, and does not deviate from the gist of the present invention, including various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention. Of course, even if there is a design change in the range, it is included in the present invention.

1 ... Cleaning equipment 2 ... Tap 3 ... Tube 4 ... Cap 5 ... Spray can 6 ... Air gun 7 ... 8a ... Air gun nozzle 8b ... Cleaning equipment Nozzle 9 ... Ejector pin 10 ... Gas vent

Claims (2)

A flexible tube for transporting the cleaning liquid ejected from the nozzle of the aerosol spray and a function of mixing and injecting the cleaning liquid and compressed air joined to the nozzle of the air gun and transported from the tube. A cleaning device comprising a mixed aerosol spraying member. A cleaning device characterized in that the cleaning device according to claim 1 is attached to a nozzle of an air gun.

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